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How do I work this problem on a TI-83 plus calculator.

use a graphing utility to graph f and g. approximate the point of intersection of the graphs of f and g if f(x) = 2^x and g(x) =8

Verified Answer :

First you click on y=
Here you fill in:
y1= 2^x
y2= 8

After that you click on second - trace (also known as calc)
This gives you a few options. You pick the fifth which will be intersect.

After that you follow the instructions the calculator gives you.
Those instructions will be: give a point near the intersection on the first graph, give a point near the intersection on the second graph, and a guess. This guess can be anything near the intersection.

Now your calculator will give you the coordinates of the intersection

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